Clark and Lex's sekrit love child!!!

From Comic Shop News #859:

Teen Titans Robin and Superboy guest-star in Superman/Batman #7, guest-illustrated by Dreamwave's Pat Lee. The two young heroes have forged a common bond - each working in the shadows of a prominent mentor, seeking to find their own identity in the super-hero world - and now work closely as teammates. Now they must deal with Robin's shocking discovery that Superboy's genetic makeup contains DNA not only from Superman, but also from Lex Luthor. Will they let their mentors know?

Maybe all those Smallville mpreg writers are onto something after all...